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Earthing / Grounding LocknutsAccessories for cable glands, available in brass, stainless steel, aluminium and nickel plated brass

CMP Products’ Grounding locknuts for use with cable glands, conduit fittings, tubing (EMT) fittings and conduit as a means of reliably and safely bonding the locknut (and gland) to the enclosure or equipment.

Providing electrical continuity and tested to the requirements of CEC and NEC wiring codes CMP’s grounding locknuts reduce the chance of equipment failure, downtime, power interruptions and eliminate potential safety issues.

Grounding locknuts are available certified with either an Ex ‘e’ grounding terminal or lay-in lug and are available in stainless steel (GRLN4), aluminum (GRLN1) and nickel plated brass (GRLN5), e.g 20GRLN4 for M20 Stainless Steel Grounding Locknut with grounding terminal

NPT grounding locknuts are supplied as standard in aluminum and Metric in nickel plated brass.

Standard – Small Lay-in Lug – 14-4 AWG
Optional – Medium Lay-in Lug – 14-2/0 AWG
Optional – Large Lay-in Lug – 6-250 AWG

AWG – American wire gauge

CLASS Catagories
C441404Grounding and Bonding Devices
C441484Grounding and Bonding Devices - Certified to US Standards
C909801Miscellaneous - For Hazardous Locations
C909881Miscellaneous - For Hazardous Locations - Certified to US Standards
cCSAus Certificate 2450309
Code of Protection Class I Zone 1 AExe II, Exe II
Introducing the Sentinel

Product Selection Table

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Ordering Reference
Aluminum with Angled Lay-in Lug
Thread Diameter
NPT
Minimum Thickness
14-4 & 14-2/0
Lug
Minimum Thickness
6-250
Lug
Across Flats
Dimension
Across Corners
Diameter
Standard 14-4 AWGOptional 14-2/0 AWGOptional 6-250 AWG*
050NPTGRLN1-4A--1/2"NPT0.48-1.201.32
075NPTGRLN1-4A--3/4"NPT0.48-1.481.63
100NPTGRLN1-4A100NPTGRLN1-10A-1"NPT0.48-1.811.99
125NPTGRLN1-4A125NPTGRLN1-10A-1 1/4"NPT0.48-2.052.25
150NPTGRLN1-4A150NPTGRLN1-10A-1 1/2"NPT0.48-2.362.60
200NPTGRLN1-4A200NPTGRLN1-10A-2"NPT0.48-2.763.03
250NPTGRLN1-4A250NPTGRLN1-10A250NPTGRLN1-252 1/2"NPT0.480.683.543.90
300NPTGRLN1-4A300NPTGRLN1-10A300NPTGRLN1-253"NPT0.480.684.334.76
350NPTGRLN1-4A350NPTGRLN1-10A350NPTGRLN1-253 1/2"NPT0.480.684.845.33
400NPTGRLN1-4A400NPTGRLN1-10A400NPTGRLN1-254"NPT0.480.685.245.76
Dimensions shown are in inches unless otherwise stated
Grounding Locknuts with Lay-in-Lug are available in Nickel Plated Brass & Stainless Steel
Lay-in-Lug will always be Aluminum regardless of locknut material
Lay-in-Lug may be angled or straight design, remove ‘A’ suffix from order reference for straight design
*No angled design available for 6-250 AWG
Ordering Reference
with Grounding Terminal
Thread
Diameter
Metric
Minimum ThicknessAcross Flats
Dimension
Across Corners
Diameter
Standard Nickel Plated BrassOptional Stainless Steel
20GRLN520GRLN4M200.481.201.32
25GRLN525GRLN4M250.481.481.63
32GRLN532GRLN4M320.481.811.99
40GRLN540GRLN4M400.482.052.25
50GRLN550GRLN4M500.482.362.60
63GRLN563GRLN4M630.482.763.03
75GRLN575GRLN4M750.483.543.90
90GRLN590GRLN4M900.484.334.76
100GRLN5100GRLN4M1000.484.845.33
115GRLN5115GRLN4M1150.485.245.76
Dimensions shown are in inches unless otherwise stated
Grounding Terminal will always be Stainless Steel regardless of locknut material
Grounding Terminal is suitable for wire sizes 0.5mm2 to 2.5mm2

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